Lenovo makes the best and most reliable windows laptops around. They are followed fairly closely by HP, Asus, and Samsung. For a variety of reasons, my nearly 30 years of working with laptops has convinced me not to consider other brands. The two most solid and reliable lines of machines are the Lenovo Thinkpads and the HP Elitebooks. Those are the business grade machines and are absolutely top tier hardware.
All laptops have problems with overheating under heavy use, particularly with the graphics processor. Laptops are carefully engineered, balancing weight and power consumption against a variety of other factors. They are designed to cool adequately under normal use in a "normal" environment. Serious gaming is generally not considered normal use unless you purchase a gaming machine. Those start at about $750 for the most basic gamers, $1000-$1250 for an okay gamer, and $1500+ for a good-great gamer.
A computer is not an investment. It is an expense, a cost, just like a car. It is a tool you use to do work which wears out and has very little value a few years later - far less than you paid for it.